Consider it appropriate to remain seated while collecting payment, on the contrary (3,3)
I believe the answer is:
see fit
'consider it appropriate to remain seated' is the definition.
I can't tell whether this definition defines the answer.
'while collecting payment on the contrary' is the wordplay.
'while' becomes 'tis' (I can't explain this - if you can you should believe this answer much more).
'collecting' is an insertion indicator.
'payment' becomes 'fee' (payment for a job).
'on the contrary' shows that the letters should be reversed in order (letters in the opposite or contrary direction).
'tis' going around 'fee' is 'tifees'.
'tifees' in reverse letter order is 'SEE FIT'.
Can you help me to learn more?
(Other definitions for see fit that I've seen before include "Consider appropriate or choose to do" , "Consider appropriate, decide to do" , "Perceive in good shape, so choose to do?" , "Consider to be proper or desirable" , "Consider suitable" .)